package com.rong.structural.facadeModel;

/**
 * 外观模式中的子系统
 */
public class Screen {

    private static  Screen instance = new Screen();

    public static Screen getInstance(){
        return instance;
    }

    private Screen(){}

    public void up(){
        System.out.println("Screen up");
    }

    public void down(){
        System.out.println("Screen down");
    }

    public void left(){
        System.out.println("Screen left");
    }
}
